Moon & Mars Orbiting Spinning Tether Transport - Tethers Unlimited

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Tethers Unlimited, Inc.MMOSTT Final ReportVI.CONCLUSIONSThe Phase I and II NIAC-funded efforts evaluated the feasibility of using rotating spacetethers to serve as the backbone of a reusable in-space transportation infrastructure. We beganby developing concept designs for tether systems for LEO-to-GTO, LEO Lunar, andEarthMars transport, and used numerical and analytical tools to demonstrate that thesesystems can be designed to account for the complex orbital dynamics in the Earth-Moon system.We then developed a realistic system-level design of a tether boost facility, based upon presentdayand near-term technologies, and evaluated the components and technologies required forthis system in terms of technology readiness. The two most important key technology needsidentified by this study were the rendezvous and capture to enable a tether to reliably pick up apayload, and the high-power electrodynamic tether propulsion systems needed to providepropellantless reboost of the tether facility in between payload transport operations. Weinvestigated these two technology needs further, developing concept designs for methods tomake these challenges solvable, and demonstrated their feasibility using detailed numericalsimulations. To continue developing the technologies needed for Momentum-Exchange/Electrodynamic-Reboost tether systems in an affordable manner, we developed aconcept design for a small initial tether boost demonstration experiment that could fly as asecondary payload on a GEO satellite launch, and could boost a microsatellite to a lunartransfer. This experiment will serve as the first step in an incremental technology developmentplan, in which an Earth-Moon-Mars tether transportation system could be deployed in stages,and each stage could perform useful transportation missions to generate revenue to fund thedevelopment and deployment of the rest of the system.19
Tether Boost Facilities forIn-Space TransportationRobert P. Hoyt, Robert L. ForwardTethers Unlimited, Inc.1917 NE 143rd St., Seattle, WA 98125-3236+1-206-306-0400 fax -0537TU@tethers.com www.tethers.comJohn Grant, Mike Bangham, Brian TillotsonThe Boeing Company5301 Bolsa Ave., Huntington Beach, CA 92647-2099(714) 372-5391
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Page 24 and 25: NIAC Funded Tether Research• Moon
Page 26 and 27: Electrodynamic Reboost• Power sup
Page 28 and 29: Cislunar Tether Transport System•
Page 30 and 31: MXER Tethers Included in NASA’sII
Page 32 and 33: 5mt Payload Tether Boost Facilityfo
Page 34 and 35: LEOGTO Boost Facility• Initial Fa
Page 36 and 37: Tether Boost FacilityControl Statio
Page 38 and 39: LEOGTO Boost Facility• TetherSim
Page 40 and 41: Rendezvous• Rapid AR&C Capability
Page 42 and 43: Proposed RETRIEVE TetherExperiment
Page 44 and 45: µTORQUE on Delta IV• Delta-IV Se
Page 46 and 47: Opportunities for NASATechnology De
Page 48 and 49: AIAA 2000-3842COMMERCIAL DEVELOPMEN
Page 50 and 51: --Commercial Tether Transport AIAA
Page 52 and 53: -Commercial Tether Transport AIAA 2
Page 54 and 55: Commercial Tether Transport AIAA 20
Page 56 and 57: Commercial Tether Transport AIAA 20
Page 58 and 59: Momentum Exchange/Electrodynamic Re
Page 60 and 61: DESIGN AND SIMULATION OF A TETHER B
Page 62 and 63: Tether Boost Facility Design AIAA 2
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Tethers Unlimited, Inc.Cislunar Tet
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Interim Report Outline- Configurati
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Mission Definition¥ Payload Capaci
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Baseline Control Station DetailsTET
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Baseline Grapple AssemblyCAPTURES A
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LEO Facility System ArchitectureGRA
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Payload Adapter Assembly Subsystems
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Potential Reeling FunctionsReeling
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LEO Control Station Weights16
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Payload Adapter Assembly Weights18
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Tether Boost FacilityRequired Power
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Electrical Propulsion Voltage´ Spe
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Potential Reeling FunctionsReeling
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Preliminary Reeling AnalysisθθAss
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Tether Boost FacilitySystem Require
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Table of Contents1 Scope ..........
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2 ReferencesThis section lists docu
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The system shall measure and contro
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4 Ground Rules & AssumptionsThis se
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Appendix F: Tether Boost Facility D
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Appendix F Tether Boost Facility De
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Appendix F Tether Boost Facility De
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Appendix L: Tether Boost Facility D
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Tethers Unlimited, Inc.Tether Rende
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Ongoing Tether Work Under NIAC Fund
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Cislunar Tether Transport System•
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Rapid Earth-Mars Transport• Reusa
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EarthMars Launch Windows• MMOSTT
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Incremental Development Path1. TORQ
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LEOGTO Boost Facility• TetherSim
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Tether Boost FacilityControl Statio
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Modular Design• Design Components
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Payload Accommodation AssemblyConfi
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Electrodynamic Thrusting• Drive c
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Tether Facility Reboost• Use Elec
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Rendezvous• Rapid Automated Rende
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Rendezvous Method: Preparation• P
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Development Issues• Automated Ren
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Potential Flight Experiments• Hig
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Opportunities for NASATechnology De
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Acknowledgements• Boeing/RSS - Jo
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IAF-99-A.5.10RAPID INTERPLANETARY T
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Rapid Interplanetary Tether Transpo
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IAF-00-S.6.04TETHER SYSTEMS FOR SAT
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IAF-00-S.6.04controlled very precis
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IAF-00-S.6.04Perigee Altitude (km)3
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IAF-00-S.6.04The LEO⇒GTO Tether B
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IAF-00-S.6.04AcknowledgmentsThis re
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Tethers Unlimited, Inc.Appendix K:
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Tethers Unlimited, Inc.at a rate of
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Tethers Unlimited, Inc.Appendix L -
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Tethers Unlimited, Inc.Appendixm M:
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Appendix N. MXER Tether for Deployi
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Electrodynamic Thrustingto Reboost
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100000 95000 90000 85000 80000 7500
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Momentum Exchange/Electrodynamic Re
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NOMENCLATURESymbol MeaningA payload
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DepartureangleA = 1.5π - (ω + u
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Tether material has a "characterist
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Rendezvous of Grapple with PayloadT
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adius vector to the new center of m
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days from payload pickup at one pla
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"JupiterandBeyond"Tether cut CUT:<
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Tethers Unlimited, Inc.Appendix Q:
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Tethers Unlimited, Inc.Appendix R:
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